See Steffen's comment on Why does a posted comment seemingly disappear into thin air.
User experience is confusing when someone posts a reply or answer that gets held up in spam quarantine.
In this scenario, the user sees that their reply/answer is submitted OK, but it disappears without explanation once the page is reloaded.
This can lead to the user (understandably) posting again and again, without realising their posts are collecting in spam quarantine behind the scenes.
When the posts are eventually released from quarantine, the result is duplicate answers/reponses.
Could the user be notifiied in some way that their reply/answer has been submitted, but is awaiting moderation before it will display? Perhaps placeholder text like 'This response is awaiting moderation' could show (to the poster only?) while the post is in spam quarantine.
Thanks for bringing this up, Sam, I opened a ticket to include a notification to the poster when their post is being held in quarantine. I hope we will be seeing this functionality soon.